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Gene Expression Profile of Pulpitis

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Gene Expression Profile of Pulpitis HHS Public Access Author manuscript Author ManuscriptAuthor Manuscript Author Genes Immun Manuscript Author . Author manuscript; Manuscript Author available in PMC 2016 October 07. Published in final edited form as: Genes Immun. 2016 June ; 17(4): 239–243. doi:10.1038/gene.2016.14. Gene expression profile of pulpitis Johnah C. Galicia1,2, Brett R. Henson3, Joel S. Parker4, and Asma A. Khan2 1 Department of Endodontics, Arthur A. Dugoni School of Dentistry, University of the Pacific, San Francisco, California, USA 2 Center for Pain Research and Innovation, Department of Endodontics, University of North Carolina School of Dentistry, Chapel Hill, North Carolina, USA 3 DDS Program, University of North Carolina School of Dentistry, Chapel Hill, North Carolina, USA 4 Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina, USA Abstract The cost, prevalence and pain associated with endodontic disease necessitate an understanding of the fundamental molecular aspects of its pathogenesis. This study was aimed to identify the genetic contributors to pulpal pain and inflammation. Inflamed pulps were collected from patients diagnosed with irreversible pulpitis (n=20). Normal pulps from teeth extracted for various reasons served as controls (n=20). Pain level was assessed using a visual analog scale (VAS). Genome- wide microarray analysis was performed using Affymetrix GeneTitan Multichannel Instrument. The difference in gene expression levels were determined by the Significance Analysis of Microarray program using a false discovery rate (q-value) of 5%. Genes involved in immune response, cytokine-cytokine receptor interaction and signaling, integrin cell surface interactions, and others were expressed at relatively higher levels in the in the pulpitis group. Moreover, several genes known to modulate pain and inflammation showed differential expression in asymptomatic and mild pain patients (≥30mm on VAS) compared to those with moderate to severe pain. This exploratory study provides a molecular basis for the clinical diagnosis of pulpitis. With an enhanced understanding of pulpal inflammation, future studies on treatment and management of pulpitis and on pain associated with it can have a biological reference to bridge treatment strategies with pulpal biology. Introduction Inflammation of the dental pulp (pulpitis) can be a progressive and devastating pain experience characterized by spontaneous or provoked pain, hyperalgesia, allodynia and difficulty in achieving adequate local anesthesia 1. The activation of dental pulp or peridental Users may view, print, copy, and download text and data-mine the content in such documents, for the purposes of academic research, subject always to the full Conditions of use: http://www.nature.com/authors/editorial_policies/license.html#terms Corresponding author: Asma A Khan, 1170 First Dental Building, CB 7450, UNC School of Dentistry, Chapel Hill, NC 27517. Conflict of Interest: The authors declare no conflict of interest. Galicia et al. Page 2 nociceptors during endodontic inflammation elicits a pain response that contributes to Author ManuscriptAuthor Manuscript Author Manuscript Author Manuscript Author approximately 90% of dental emergency visits in both private dental clinics and in hospitals 2-5. The economic implication of these emergency visits is reported to cost almost US$1 billion per year 4. However, despite the cost and the prevalence of endodontic disease and the great discomfort associated with it, the fundamental molecular aspects of its pathogenesis are still not fully understood. The current literature on pulpal immune response to microbial infection continues to expand but very little is known on the regulatory mechanisms behind pulpal disease. Cells comprising the human dental pulp trigger immune responses to a complex array of microorganisms that invade dental tissues 6-8. These immunocompetent cells also form mechanical barriers (i.e. odontoblasts), detect and transmit sensations (nerve fibers) or differentiate (i.e. dental pulp stem cells) to limit infection, signal injury and promote repair, respectively. These cascades of events resulting from dental pulp stimulation by microorganisms result in the release of a plethora of immune mediators that trigger pulpal or odontogenic pain, inflammation or in advanced stages, pulpal necrosis. In addition, several studies have suggested that pulpal events can be reflected in the gingival crevicular fluid (GCF) through measurable levels of protein markers that correlated with pulpal symptoms 9, 10. This shows that the dental pulp is not an isolated environment but rather a vital, reactive tissue that communicates with the outside environment. Several studies have identified the biological differences between healthy and inflamed dental pulp. Cytokines, cell surface receptors and other protein markers are shown to be either highly increased or decreased in inflamed dental pulp.7, 11-21. A limited number of studies have examined gene expression in inflamed human pulps 22-24. These studies, however, did not explore the differences in gene expression between normal and inflamed dental pulp and the clinical presentation of donor patients (i.e. pain and swelling), which may provide biologic explanation on the variability of clinical signs and symptoms of pulpal inflammation that confound diagnosis. Although the clinical value of a molecular diagnostic marker may at first appear limited in scope, the emerging correlation of gene expression with clinical signs and symptoms will enhance our understanding on the development of pulpal inflammation - this will add not only to the knowledge base but it will also provide a biological basis for the varying clinical presentations of pulpitis. Prior studies that focused on histological findings have shown a wide variation – from poor to strong - in correlating clinical signs and symptoms with histological findings 25-27. In this study, data from the full genome scan will be utilized to determine if an association exists between gene expression and clinical presentation (i.e. pain) of pulpitis patients. Results and Discussion Normal and pulpitis samples exhibited differentially expressed genes The SAM software generated GSEA data which showed a significantly higher expression of various gene sets that are associated with immune response activation, maintaining cellular function and cell-to-cell interaction, among others (Figure 1) in pulpitis samples. This Genes Immun. Author manuscript; available in PMC 2016 October 07. Galicia et al. Page 3 underscores the utility of both the subjective (patient-derived history) and objective Author ManuscriptAuthor Manuscript Author Manuscript Author Manuscript Author (endodontist-performed testing) diagnostic techniques that clinically delineate a normal from an inflamed dental pulp. Furthermore, the results above re-establish the immunocompetency of the dental pulp that has been shown to carry Toll-like receptor (TLR) -2/4+ cells 7, 28. Differences in gene expression between mild and moderate to severe pain Among the patients diagnosed with irreversible pulpitis, eight patients reported experiencing zero to mild pain ((≤30mm on VAS) and twelve patient reported moderate to severe pain. The mean VAS scores for patients who reported zero to mild pain and moderate to severe pain was 6.63 (SD = 9.29) and 81.93 (SD = 11.21), respectively (P <0.0001). There were differentially expressed genes between the two groups (Figure 2). Mild pain samples showed a significantly higher expression of genes involved in adaptive immune system, cytokine to cytokine interaction and cytokine signaling, among others. However, when looking at specific genes, several of them that have key roles in inflammation are significantly under- expressed, unchanged or over-expressed in asymptomatic or mild pain patients compared to those with moderate to severe pain (Table 1). Relief from pain is a very important part in the practice of endodontics. Patients often judge the success of treatment and the efficiency of the dentist based on their pain experience. The decision whether to perform root canal therapy (RCT) to relieve pain or manage infection relies heavily on clinical diagnostic tests which dichotomize the pulpal diagnosis to reversible and irreversible pulpitis. To arrive at a diagnosis, dentists depend mainly on pain history and responses to sensibility tests (namely thermal tests and electric pulp testing,) that have been used for decades; but whether the responses to these clinical tests correlate well with pulpal histopathology or not remains unclear 25-27, 29-31. This study was aimed to identify the differences in gene expression between normal pulps and pulpitis samples and between mild and moderate to severe pulpitis pain, based on the diagnostic guidelines set by the AAE and on the patient-reported pain experience at the time of endodontic treatment, respectively. Gene Set Enrichment Analysis (GSEA) was employed for the analysis of the thousands of genes included in the microarray screening 32, 33. The Broad Institute defines GSEA as a computational method that determines whether an a priori defined set of genes shows statistically significant, concordant differences between two biological states. Several applications are envisioned for the data that were gathered in this study. First, a biological basis at the molecular level can now be correlated not only with the current diagnostic testing procedures but also with the diagnosis of irreversible
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